/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.rendering.xslt;

import java.util.LinkedHashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apereo.portal.layout.IStylesheetUserPreferencesService;
import org.apereo.portal.layout.IStylesheetUserPreferencesService.PreferencesScope;
import org.apereo.portal.layout.om.IStylesheetDescriptor;
import org.apereo.portal.layout.om.IStylesheetParameterDescriptor;
import org.apereo.portal.utils.cache.CacheKey;
import org.apereo.portal.utils.cache.CacheKey.CacheKeyBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * Exposes transformer parameters from {@link
 * IStylesheetDescriptor#getStylesheetParameterDescriptors()}
 *
 */
public abstract class StylesheetDescriptorTransformerConfigurationSource
        extends TransformerConfigurationSourceAdapter implements BeanNameAware {
    protected final Logger logger = LoggerFactory.getLogger(this.getClass());

    protected IStylesheetUserPreferencesService stylesheetUserPreferencesService;
    private String beanName;

    @Autowired
    public void setStylesheetUserPreferencesService(
            IStylesheetUserPreferencesService stylesheetUserPreferencesService) {
        this.stylesheetUserPreferencesService = stylesheetUserPreferencesService;
    }

    @Override
    public void setBeanName(String name) {
        this.beanName = name;
    }

    @Override
    public final CacheKey getCacheKey(HttpServletRequest request, HttpServletResponse response) {
        final CacheKeyBuilder cacheKeyBuilder = CacheKey.builder(this.getName());

        final PreferencesScope preferencesScope = this.getStylesheetPreferencesScope(request);

        final IStylesheetDescriptor stylesheetDescriptor =
                this.stylesheetUserPreferencesService.getStylesheetDescriptor(
                        request, preferencesScope);

        //Build key from stylesheet descriptor parameters
        for (final IStylesheetParameterDescriptor stylesheetParameterDescriptor :
                stylesheetDescriptor.getStylesheetParameterDescriptors()) {
            final String defaultValue = stylesheetParameterDescriptor.getDefaultValue();
            if (defaultValue != null) {
                final String name = stylesheetParameterDescriptor.getName();
                cacheKeyBuilder.put(name, defaultValue);
            }
        }

        return cacheKeyBuilder.build();
    }

    @Override
    public final Map<String, Object> getParameters(
            HttpServletRequest request, HttpServletResponse response) {
        final PreferencesScope preferencesScope = this.getStylesheetPreferencesScope(request);

        final IStylesheetDescriptor stylesheetDescriptor =
                this.stylesheetUserPreferencesService.getStylesheetDescriptor(
                        request, preferencesScope);

        //Build map of stylesheet descriptor parameters
        final LinkedHashMap<String, Object> parameters = new LinkedHashMap<String, Object>();
        for (final IStylesheetParameterDescriptor stylesheetParameterDescriptor :
                stylesheetDescriptor.getStylesheetParameterDescriptors()) {
            final String defaultValue = stylesheetParameterDescriptor.getDefaultValue();
            if (defaultValue != null) {
                final String name = stylesheetParameterDescriptor.getName();
                parameters.put(name, defaultValue);
            }
        }

        return parameters;
    }

    protected String getName() {
        return this.beanName;
    }

    protected abstract PreferencesScope getStylesheetPreferencesScope(HttpServletRequest request);
}